Bingo, doesn't it **** you off that you pay a "professional" to provide a level pad and they can't do it. I'm seriously considering shorting them on the final payment by what it cost me to take the two days off that I spent making it right.

Hey, I ment to ask earlier, but what kind of wood is that around the very bottom? Where the concrete is up against? From the first picture, it looks like regular lumber. If it is, that is a big no no, its GOT to be pressure treated...

The posts, bottom pieces, and first row of side ribbing(2' above the concrete) are all pressure treated.

Also, we had a weird set of events with the slab. The 'normal' slab is 4" of 4 bag concrete. We ordered 6" of 4.5 bag with zip strip and fiber-mesh and planned to lay down re-bar to be certain we'd be good to go for putting a lift in and putting heavy trucks on the lift. Nothing came out right.

We ended up with no re-bar due to an inability of the two different contractors to work a mutual schedule out. Then, the same contractor who couldn't get the re-bar in on schedule also didn't level the pad properly, so we had to do it ourselves. We ended up a touch deep(by design on my part). Then, the zip strip wasn't provided. At this point I was getting worried...no re-bar and no zip strip. Then, the first concrete truck had its transmission go out as it was en-route. So, they get another truck, but that truck wasn't filling with 4.5 bag mix, it was filling with 6 bag mix, which we got at no extra charge since it was their issue. The concrete guy looked at the pad and said we'd done a great job prepping it. It was very well compacted(for the most part) and averaged 7" deep. They did remember to bring the fiber-mesh.

So, we ended up with 7" of fiber-mesh reinforced 6 bag concrete. I asked them about cracking and the missing re-bar and zip strip and explained my planned use of the space. They said that with the pad I had underneath, the depth of the pour, the fiber-mesh, and the 6 bag mix I would need to let it cure a full 21 days before I put vehicles on it. But, if I did give it plenty of time it should cure without cracking and be strong enough to drive a tank on. It seems to have all worked out for the best.

Building inspections are all signed off. Electrical is all done and signed off. I'm now fitting out the inside. I put some insulation around the bottom half and used spray foam insulation to plug all the gaps around the base where the metal and wood contact. It isn't 100% air tight, but it should keep any critters out.(spiders are another story, darn near impossible to keep them out)